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This article examines the cross-national differences in socioeconomic accessibility to shadow education (SE) across 63 societies. Drawing on arguments from two competing theoretical models either emphasizing cross-national cultural, economic, and institutional differences (e.g. model of secondary schooling, scale of SE) or universally working social reproduction mechanisms (e.g. enrichment features of SE), this study provides a novel approach to understanding the role of SE for social inequality. More specifically, while the first model explicitly allows equality in access to SE, the latter suggests that SE fosters inequality under all circumstances. Using data from the 2012 Program for International Student Assessment (PISA) and official sources, first, the difference in the probability of top in comparison to bottom socioeconomic strata to use SE is predicted separately for all societies, before analyzing what causes the found considerable cross-national variation in the socioeconomic gap in access to SE at the country level. Results indicate that differences in SE access are linked to incentives for high-performing students to use SE. These incentives are especially common in societies with higher educational institutional differentiation (e.g. early or mixed tracking schooling models). In societies with less stratified education systems, access to SE is more equal, wherefore the potential effect of SE to social inequality is dampened. Overall, findings suggest that simple generalizations based on existing theoretical models provide no comprehensive explanation for the connection between SE and inequality. Instead, prominent beliefs about the relationship between SE and inequality are questioned.

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In Germany we observe a strong increase in the enrolment in shadow education (‘Nachhilfe’) over the last two decades. To explain this development we draw on social reproduction theories identifying two strategies: (1) families seek competitive advantages for their children to maintain or achieve an advantageous education level (status attainment strategy); and (2) families seek performance improvement for their low performing children in order to meet the high demands in the pursuit of the highest school diploma (compensatory strategy). To test our theoretical ideas, we estimate regression models using data from the 2012 German LifE study. We find that shadow education is primarily used by disadvantaged educational strata to deal with higher demands in school. We conclude that the increased investment in Nachhilfe is an unintended but not yet negative outcome of educational expansion and recent educational reforms in Germany.

The aim of this paper is to clarify in what ways school performance and out-of-school lessons are linked, with special emphasis on social disparities in educational attainment. Previous research about shadow education indicates that out-of-school education may indeed be a factor to improve the academic achievement of school students. On the other hand, it is stated nearly without exception that the socioeconomic background of a student plays a significant role for academic achievement as well. Using data of the 2009 Programme for International Student Assessment (PISA), this paper shows new findings in comparing effects of shadow education investments on students' performance in Japan and Germany. I found that out-of-school education investments in both countries led to four significant outcomes: (i) in Japan, high school students' academic achievement is increased due to out-of-school lessons; (ii) in both countries there is great variation in how out-of-school lessons affect academic performance according to the types of out-of-school lessons and the living area; (iii) out-of-school education determines higher achievement scores in international comparison in a decisive way and therefore provides a reasonable explanation for the Japanese success in PISA; and (iv) since the mid-1990s the system in Japan has advanced from a mixed to a predominantly enrichment out-of-school education system, while the German outof-school education system is still of remedial character.